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A soft in and soft out detection method capable of reducing the complexity

A technology of soft input and soft output, detection method, applied in the direction of preventing/detecting errors through diversity reception, and can solve the problem of high complexity

Inactive Publication Date: 2007-10-17
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It requires matrix inversion operation, the complexity is O((Nr) 3 ), the complexity is very high

Method used

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  • A soft in and soft out detection method capable of reducing the complexity
  • A soft in and soft out detection method capable of reducing the complexity
  • A soft in and soft out detection method capable of reducing the complexity

Examples

Experimental program
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Effect test

Embodiment Construction

[0056] A low-complexity Turbo iterative receiver for a MIMO system with 4 transmit and 4 receive antennas is provided below.

[0057] (1) At the sending end, the information sequence {b m}(m=1, L, K) is convolutionally coded as {c l} (l=1, L, N). In order to resist the burst error of the channel, the coding sequence {c l}(l=1, L, N) is randomly interleaved into {d l} (l=1, L, N). After interleaving, the bit sequence is serially converted into 4 subsequences, corresponding to each transmitting antenna. The block diagram of the transmitter and receiver is shown in Figure 1.

[0058] (2) Bits on each antenna are mapped into symbols and sent out through corresponding antennas. After quasi-static flat channel fading, the signal at the receiving end is:

[0059] the y t =H t x t +n t

[0060] where H t The (i, j) elements of is the channel fading factor from the j-th transmit antenna to the i-th receive antenna at time t, x t =[x t，1 , ...

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Abstract

The present invention provides a soft-inlet-soft-outlet detecting method which can reduce the complexity through replacing the instantaneous covariance matrix by the average of the emitting symbol vector covariance matrix, namely one of said average channel values is used to replace the channel value of the whole region. Thus, Nt*T*F of matrix inverses are simplified to form one matrix inverse. In the present invention, only one time of matrix inverse is required in a high correlation channel region, and the complexity of the system is reduced greatly without any losing.

Description

technical field [0001] The invention belongs to the technical field of multi-transmission and multi-reception antennas in a wireless communication system, and in particular relates to a soft-in and soft-out detection method applied to a space-time iterative receiver and capable of reducing complexity. Background technique [0002] Consider a MIMO-OFDM communication system with Nt transmitting antennas and Nr receiving antennas, which contains the following steps: [0003] The information bits at the sending end are channel-coded first, and the coded bits are sent to the interleaver for interleaving in order to resist burst errors. Then the obtained bits are space-time coded and mapped to multiple transmitting antennas, and are simultaneously transmitted by Nt transmitting antennas. [0004] (1) The model of the received signal after OFDM demodulation is: [0005] Y t，f =H t，f x t，f +n t，f [0006] where H t，f The (i, j) elements of tth OFDM...

Claims

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Application Information

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IPC IPC(8): H04L1/06
Inventor 林文峰夏小梅杨秀梅赵巍汪凡熊勇张小东卜智勇王海峰
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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